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Inserting Query Results into Singlestore Table with Python and Sqlalchemy

I have parameterized queries with f strings such that the queries will select some data from a series of tables and joins, and I want to insert the resulting set of data into another pre-created table (tables been designed to house these results).
Python executes the code but the query results never show up in my table.
Assuming target_table is already created in singlestore database:
qry_load = 'insert into target_table select * from some_tables'
conn = engine.connect()
trans = conn.begin()
try:
conn.execute(qry_load)
trans.commit()
except:
trans.rollback()
raise
The code executes and acts as if all is ok, but the data never shows up in the target table.
How do I see what singlestore is passing back to better debug what is happening within the database?

Just replace begin() with cursor() function:
conn = engine.connect()
trans = conn.cursor()
If not resolved
1- Verify structure of source and destination tables if they are same or not.
2- remove try ,except and rollback() block so you can know the actual error.
Ex.
qry_load = 'insert into target_table select * from some_tables'
conn = engine.connect()
trans = conn.cursor()
conn.execute(qry_load)
trans.commit()

PostgreSQL Error while executing sql command in Python

i've been trying to get some data from my db by using below code, but the code is not working. is there any mistake that i made in the code, if so how can i fix it.
NOTE: i took the below code from just a script not a django or flesk web app.
def db():
conn = psycopg2.connect(
"dbname=mydb user=postgres password=****** host=*.*.*.*")
cur = conn.cursor()
cur.execute("""SELECT * FROM MddPublisher""")
query_results = cur.fetchall()
print(query_results)
db()
ERROR: psycopg2.errors.UndefinedTable: relation "mddpublisher" does not exist LINE 1: SELECT * FROM MddPublisher
additionally,i want to show below code to prove that connection is ok. the problem is that i can't receive data from my db whenever i try to execute select command through python.
def print_tables():
conn = psycopg2.connect(
"dbname=mydb user=postgres password=***** host=*.*.*.*.*")
cur = conn.cursor()
cur.execute("""SELECT table_name FROM information_schema.tables
WHERE table_schema = 'public'""")
for table in cur.fetchall():
print(table)
print_tables()
OUTPUT:
('MddPublisher',)

This is probably an issue with case sensitivity. Postgresql names are usually normalized to lower case. However, when used inside double quotes, they keep their case. So, to access a table named MddPublisher you must write it like "MddPublisher".
All the gory details are in Section 4.1.1, Identifiers and Key Words in the Postgresql 14 docs.

Inserting values from Python into SQL Server

I want to insert values into a SQL Server table, from Python.
Here is my table in SQL Server:
CREATE TABLE DB.type.[Ref]
(
[Type_Ref] varchar(65),
[ID_match] varchar(65),
[Data] varchar(65)
PRIMARY KEY ([Type_Ref], [ID_match])
)
To insert values from python I wrote this code:
conn = pyodbc.connect('Driver={ODBC Driver 17 for SQL Server};'
'Server=????;'
'Database=DB;'
'Trusted_Connection=yes;')
cursor = conn.cursor()
sql = "INSERT INTO DB.Ref (Type_Ref, ID_match, Data) VALUES (?, ?, ?)"
cursor.execute(sql, (DATA[Type_Ref], DATA[ID_match], DATA[Data]))
conn.commit()
cursor.close()
conn.close()
However, when I run Python, I don't see any rows of data in SQL Server...
I noticed my IDE is giving this, after I run the python code above:
Process finished with exit code -1073741819 (0xC0000005)
Solution: I solved this problem by deleting the table in sql-server and create a new one.

I think you are not building your conn object correctly. When I try to match your pattern, I receive a TypeError. Try this instead:
server='server'
database='database'
user='username'
password='secret'
conn = pyodbc.connect(
server=server,
database=database,
user=username,
password=password,
port=1433,
driver='ODBC Driver 17 for SQL Server'
)
The rest of your code looks like it should work fine.

try the following:
Columns = ['Type_Ref', 'ID_match', 'Data']
sql = "INSERT INTO dbo.Ref([Type_Ref], [ID_match], [Data]) VALUES (?,?,?)"
cursor.executemany(sql, DATA[Columns].values.tolist())
conn.commit()

Thaks for the help, I solved this problem by deleting the table in sql-server and create a new one.

cx_oracle executes without error, but does not delete data

I would to remove all customers who's names begin with SCH from my database. When I execute the code below it runs without error, but does not remove the data from the database.
cur = db.cursor()
sql = "DELETE FROM customers where IMAGE_ID like 'SCH%'"
cur.execute(sql)

after delete you need commit
conn = cx_Oracle.connect(...)
cur = db.cursor()
sql = "DELETE FROM customers where IMAGE_ID like 'SCH%'"
cur.execute(sql)
conn.commit()
cur.close()
conn.close()

Python MySQLdb doesn't return all the data from the database

I'm using the Python package MySQLdb to fetch data from a MySQL database. However, I notice that I can't fetch the entirety of the data.
import MySQLdb
db = MySQLdb.connect(host=host, user=user, passwd=password)
cur = db.cursor()
query = "SELECT count(*) FROM table"
cur.execute(query)
This returns a number less than what I get if I execute the exact same query in MySQL Workbench. I've noticed that the data it doesn't return is the data that was inserted into the database most recently. Where am I going wrong?

You are not committing the inserted rows on the other connection.